Created attachment 410613 [details] a reproducer Originally reported by Jakub Sochor. Version-Release number of selected component (if applicable): valgrind-3.5.0-16.fc12 How reproducible: code dependent Steps to Reproduce: 1. download the attached reproducer 2. sh valgrind-fork-sigsegv.c Actual results: $ sh valgrind-fork-sigsegv.c valgrind-fork-sigsegv.c: line 4: 10005 Segmentation fault (core dumped) valgrind -q ./a.out Expected results: no crash Additional info: The crash does not occur if the call of fprintf() is omitted.
Created attachment 410658 [details] more reliable reproducer The call of sleep() ensures it works on faster computers, too.
upstream bug: https://bugs.kde.org/show_bug.cgi?id=237920
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issue still present in valgrind-3.5.0-17.fc13.x86_64, easy to reproduce...
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issue still present in valgrind-3.5.0-20.fc14.x86_64, easy to reproduce...
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The upstream bug is still open, but I can no longer replicate with valgrind > 3.6.0. I could replicate it with valgrind 3.5.0.
Actually I could just now replicate it again against valgrind-3.8.0-1.fc18.x86_64
This bug appears to have been reported against 'rawhide' during the Fedora 19 development cycle. Changing version to '19'. (As we did not run this process for some time, it could affect also pre-Fedora 19 development cycle bugs. We are very sorry. It will help us with cleanup during Fedora 19 End Of Life. Thank you.) More information and reason for this action is here: https://fedoraproject.org/wiki/BugZappers/HouseKeeping/Fedora19
still a bug in valgrind-3.10.1-1.fc21.x86_64
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Still reproducible with valgrind-3.11.0-1.fc23.x86_64 and 'ulimit -u 512'.
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Still reproducible with valgrind-3.12.0-1.fc25.x86_64 and attachment #410658 [details].
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Still reproducible with valgrind-3.13.0-10.fc28.x86_64 and attachment #410658 [details].
(In reply to Kamil Dudka from comment #19) > Still reproducible with valgrind-3.13.0-10.fc28.x86_64 and attachment > #410658 [details]. Thanks for testing. There have been several changes to how valgrind handles forks in the last version. But apparently there are still races.
This bug appears to have been reported against 'rawhide' during the Fedora 28 development cycle. Changing version to '28'.
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I cannot replicate this anymore with valgrind-3.15.0-1.fc30.x86_64
I am still able to crash valgrind-3.15.0-2.fc31.x86_64 using attachment #410658 [details].
This bug appears to have been reported against 'rawhide' during the Fedora 31 development cycle. Changing version to '31'.
This bug appears to have been reported against 'rawhide' during the Fedora 31 development cycle. Changing version to 31.
This message is a reminder that Fedora 31 is nearing its end of life. Fedora will stop maintaining and issuing updates for Fedora 31 on 2020-11-24. It is Fedora's policy to close all bug reports from releases that are no longer maintained. At that time this bug will be closed as EOL if it remains open with a Fedora 'version' of '31'. Package Maintainer: If you wish for this bug to remain open because you plan to fix it in a currently maintained version, simply change the 'version' to a later Fedora version. Thank you for reporting this issue and we are sorry that we were not able to fix it before Fedora 31 is end of life. If you would still like to see this bug fixed and are able to reproduce it against a later version of Fedora, you are encouraged change the 'version' to a later Fedora version prior this bug is closed as described in the policy above. Although we aim to fix as many bugs as possible during every release's lifetime, sometimes those efforts are overtaken by events. Often a more recent Fedora release includes newer upstream software that fixes bugs or makes them obsolete.
I am still able to crash valgrind-3.16.1-6.fc34 using attachment #410658 [details].
This bug appears to have been reported against 'rawhide' during the Fedora 34 development cycle. Changing version to 34.
FEDORA-2021-07e75edcab has been submitted as an update to Fedora 34. https://bodhi.fedoraproject.org/updates/FEDORA-2021-07e75edcab
FEDORA-2021-07e75edcab has been pushed to the Fedora 34 testing repository. Soon you'll be able to install the update with the following command: `sudo dnf upgrade --enablerepo=updates-testing --advisory=FEDORA-2021-07e75edcab` You can provide feedback for this update here: https://bodhi.fedoraproject.org/updates/FEDORA-2021-07e75edcab See also https://fedoraproject.org/wiki/QA:Updates_Testing for more information on how to test updates.
Apparently still fails for the reporter, so for now removed from the update.
I am still able to reproduce it on a fresh 1minutetip Fedora 34 machine. For some reason, the bug does not trigger for the root user, only for the unprivileged one: # yum -y install valgrind --enablerepo=updates-testing # su - fedora $ rpm -q valgrind valgrind-3.18.1-1.fc34.x86_64 $ curl -o valgrind-fork-sigsegv.c -s 'https://bugzilla-attachments.redhat.com/attachment.cgi?id=410658' $ sh valgrind-fork-sigsegv.c valgrind-fork-sigsegv.c: line 4: 1288 Segmentation fault (core dumped) valgrind -q ./a.out
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The bug is still reproducible with valgrind-3.19.0-1.fc37.
This bug appears to have been reported against 'rawhide' during the Fedora Linux 37 development cycle. Changing version to 37.